package cn.huanba.filter;

import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.core.Ordered;
import org.springframework.core.io.buffer.DataBuffer;
import org.springframework.http.HttpStatus;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.stereotype.Component;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;


/**
 * 鉴权过滤器
 */
@Component
public class AccessFilter implements GlobalFilter, Ordered {
    /**
     * 鉴权（需要携带token参数）
     * @param exchange
     * @param chain
     * @return
     */
    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
        String token = exchange.getRequest().getQueryParams().getFirst("token");

        if (null==token) {
            ServerHttpResponse response=exchange.getResponse();
            //响应类型
            response.getHeaders().add("Content-Type","application/json;char=utf-8");
            //响应状态码
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            //响应内容
            String msg="{\"message\":\""+HttpStatus.UNAUTHORIZED.getReasonPhrase()+"\"}";
            DataBuffer buffer=response.bufferFactory().wrap(msg.getBytes());
            //请求结束
            return response.writeWith(Mono.just(buffer));
        }
        return chain.filter(exchange);
    }

    @Override
    public int getOrder() {
        return 1;
    }
}
